Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic hedges	9 Months Ended	12 Months Ended
	Sep. 30, 2015 Bcfe GWh	Dec. 31, 2014 Bcfe GWh
Electricity options, swaps and forwards (GWh)
Derivatives
Notional volumes of derivative instruments	4,807	3,618
Natural gas options, swaps and forwards (Bcf)
Derivatives
Notional volumes of derivative instruments | Bcfe	64	83
Congestion revenue rights (GWh)
Derivatives
Notional volumes of derivative instruments	103,207	122,859
Tolling arrangements (GWh)
Derivatives
Notional volumes of derivative instruments	73,008	79,989